cxl/mem: Remove unused CXL_CMD_FLAG_NONE define

CXL_CMD_FLAG_NONE is not used, remove it.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20221222-cxl-misc-v4-1-62f701c1cdd1@intel.com


Signed-off-by: Dan Williams <dan.j.williams@intel.com>